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<p>Reports cases when a custom exception class is
  raised but does not inherit from the
  <a href="https://docs.python.org/3/library/exceptions.html">builtin Exception class</a>.</p>
<p><b>Example:</b></p>
<pre><code>
class A:
    pass


def me_exception():
    raise A()
</code></pre>
<p>The proposed quick-fix changes the code to:</p>
<pre><code>
class A(Exception):
    pass


def me_exception():
    raise A()
</code></pre>
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